In the premise of achieving corresponding functions, sustainable design means to take the most natural, harmless and energy-saving materials to realize the product functions to meet the need of the present without compromising the ability of future generation to meet their own needs. While with the Chinese characteristic features and the endless expansion demand on consumption, design is going on the opposite direction. The product design research based on sustainable concept is a re-examined view of human-oriented design in front of the challenge of limited resources protection. And with the help of unlimited creativities and design, we can care more about our nature and society on one hand. On the other hand, the silent affection and promotion on green, energy-saving and low-carbon living concept will also definitely influence our human being to be more rational.

The full-bridge pulse-width-modulation (PWM) inverter is wildly applied to drive the electromagnet and enables advanced technologies, such as the active magnetic bearing (AMB) and the permanent-electro magnetic suspension (PEMS). However, the characteristic relationship between the current through the electromagnet and the duty cycle of the PWM signal has strong nonlinearity around the zero current. Moreover, the electromagnet possesses the induction that results in the time constant and significantly hinders the change of the current. Hence, the open-loop control of the full-bridge PWM inverter cannot accurately or timely tune the current through the electromagnet, especially around the zero current. This work proposes a closed-loop current control approach by three steps: (1) inserting a current-sensing resistor into the middle of the electromagnet, (2) obtaining the current signal with an analog signal-processing circuit, and (3) generating the PWM signal with the bang-bang control circuit. The proposed approach innovatively arranges the current-sensing resistor to take advantage of the symmetry and to minimize the influence from the high-frequency switching of the inverter, so that the measured current signal is comparable to the hall-effect current sensor. The experimental results demonstrate the effectiveness and efficiency of the proposed closed-loop current control approach, though the weak charging capability of the full-bridge PWM inverter still hinders its performance.

On the base of green design concept, multi-functional product design is given a new meaning. It is no longer simply a combination of multi-functional functions, but to extend product function on the bases of no extra cost and no waste of materials. Through fuzzy functional design, integrated design of related functions, developing the secondary function of product, as well as enhancing the product spiritual function and other ways, we can achieve multi-functional design of products.

The method of traditional architectural decoration design can not meet the requirtments of modern industrlization for the disadvantages of excessive consumption on time and human resources as well as the inclination to high error rate . Computer aided technology, as an efficient auxiliary tool, while, facilitate the design of construction blueprint with the ability of powerful data processing and storaging, which achieve the realization of overcome of the disvantages amentioned before.

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